/*
 *  Copyright 2008-2010 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


/*! \file partition.h
 *  \brief Host implementations of partition functions
 */

#pragma once

#include <thrust/distance.h>

#include <algorithm>
#include <thrust/partition.h>

namespace thrust {

namespace detail {

namespace host {

template < typename ForwardIterator,
         typename Predicate >
ForwardIterator partition(ForwardIterator first,
                          ForwardIterator last,
                          Predicate pred) {
    return std::partition(first, last, pred);
}


template < typename ForwardIterator,
         typename Predicate >
ForwardIterator stable_partition(ForwardIterator first,
                                 ForwardIterator last,
                                 Predicate pred) {
    return std::stable_partition(first, last, pred);
}

template < typename ForwardIterator1,
         typename ForwardIterator2,
         typename Predicate >
ForwardIterator2 stable_partition_copy(ForwardIterator1 first,
                                       ForwardIterator1 last,
                                       ForwardIterator2 result,
                                       Predicate pred) {
    for (ForwardIterator1 iter = first; iter != last; iter++)
        if (pred(*iter)) {
            *result++ = *iter;
        }

    ForwardIterator2 middle = result;

    for (ForwardIterator1 iter = first; iter != last; iter++)
        if (!pred(*iter)) {
            *result++ = *iter;
        }

    return middle;
}

template < typename ForwardIterator1,
         typename ForwardIterator2,
         typename Predicate >
ForwardIterator2 partition_copy(ForwardIterator1 first,
                                ForwardIterator1 last,
                                ForwardIterator2 result,
                                Predicate pred) {
    return thrust::experimental::stable_partition_copy(first, last, result, pred);
}

} // end namespace host

} // end namespace detail

} // end namespace thrust

